These are normal greeting card stock from Michaels or WalMart.
Designing graduation cards for 18 year old grandsons causes me to pause.
Flowers and hearts are out.
But I like the idea of BOLD color and BOLD print and not too much print. Just the basics please.
All the colors are watercolor. Printing is inks and pens of various shapes and sizes. Color blocks that go over ink are Tombow pens.
The money is held down with hand-made Washi tape. I can do this because we will be handing the cards to the boys and they don't need to go through the mail.
Ideas from Joann Sharpe's book The Art of Whimsical Lettering.